ASME B17.1 Class 1 Machine Keys

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1008-1045 Carbon Steel

1018-1045 Carbon Steel

Minimum Hardness

Specifications Met

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Hardness

RoHS

Export Control Classification Number (ECCN)

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152 Products

Machine Keys

Straight keys, with a square or rectangular cross section, are the most common type of key. Install them in keyways to transmit torque from shafts to gears and other components. Machine keys are often the same material as the shaft and other components with which they are used. To use a key as a sacrificial part, choose a softer key that will shear off when parts are exposed to excessive force, preventing damage to expensive equipment.

1008-1045 Carbon Steel—Steel keys are strong and easy to machine. Since steel is the most common material, these keys work in many applications. Steel keys rust when exposed to moisture, so they should only be used in dry environments.

Zinc-Plated 1008-1045 Carbon Steel— Zinc-plated steel keys resist corrosion in wet environments.

Undersized Tolerance—Slightly smaller than the size listed in the table, undersized keys are the choice when you need a slightly looser fit or when you have an inconsistent keyway. Use them when parts need to be taken apart frequently, such as for maintenance or prototyping.

ASME B17.1 Class 1—Keys that meet ASME B17.1 specifications conform to ASME standards for dimensions and tolerances.

			Tolerance
	Lg.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
1008-1045 Carbon Steel







				1/8" × 1/8"

				1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	000000


				1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
				3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
				1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
				1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
				1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000




						3/16" × 3/16"

						1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	000000000	0000


						1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
						3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
						7/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	000000000	0000
						1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
						1 1/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	000000000	0000
						1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
						1 3/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
						1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
						1 3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
						2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000


						2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
						3"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	000000000	0000
						4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	000000000	00000




								1/4" × 1/4"

								1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	000000000	00000


								3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
								1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
								1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
								1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
								1 3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
								2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
								2 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
								2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
								3"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	00000
								3 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	10	000000000	00000


								4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	000000000	0000
								5"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	000000000	00000




								5/16" × 5/16"

		1 1/4"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000


		1 1/2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
		2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	00000
		2 1/2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	00000




								3/8" × 3/8"

								1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	000000000	0000


				1 1/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	0000
				1 1/2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	00000
				1 3/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	000000000	0000
				2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	00000
				2 1/2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	000000000	00000
				2 3/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000




								1/2" × 1/2"

								1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	1	000000000	0000


								1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	000000000	00000
								1 5/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
								2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	000000000	00000
								2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	000000000	00000
								3"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	000000000	00000
								3 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B97	ASME B17.1 Class 1	5	000000000	00000


						Zinc-Plated 1008-1045 Carbon Steel







										3/16" × 3/16"

										1 3/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	10	0000000	00000

Rounded Machine Keys

When installed, these keys fill oval keyways completely, reducing stress on the key and shaft. Using them in a closed keyway keeps them from sliding along the shaft axis. The rounded ends make it easy to slide gears, hubs, and other components into place. These are also known as feather keys. Machine keys are often the same material as the shaft and other components with which they are used. To use a key as a sacrificial part, choose a softer key that will shear off when parts are exposed to excessive force, preventing damage to expensive equipment.

Zinc-Plated 1008-1045 Carbon Steel— Zinc-plated steel keys resist corrosion in wet environments.

Oversized Tolerance—Slightly larger than the size listed in the table, oversized keys fit tightly in a keyway. Press them into place for use in high-torque applications or to replace a key in a worn keyway.

ASME B17.1 Class 1—Keys that meet ASME B17.1 specifications conform to ASME standards for dimensions and tolerances.

			Tolerance
	Lg.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met	Pkg. Qty.		Pkg.
1008-1045 Carbon Steel







				1/8" × 1/8"

				1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000


				3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
				1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000




						3/16" × 3/16"

						1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000


						3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	000000000	0000
						1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	000000000	0000
						1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
						1 3/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
						1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	000000000	00000
						2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000




								1/4" × 1/4"

								3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000


								1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
								1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	000000000	0000
								1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Rockwell B50	ASME B17.1 Class 1	5	000000000	0000
								1 3/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
								2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000
								2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000




										3/8" × 3/8"

										1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000


										1 1/4"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000
										1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000
										2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000
										2 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000




												1/2" × 1/2"

												1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000


1 1/2"	Undersized											-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000
1 5/8"	Undersized											-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000
2"	Undersized											-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000
3"	Undersized	-0.002" to 0.000"										-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	1	000000000	0000
3 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"									Not Rated	ASME B17.1 Class 1	1	000000000	0000


Zinc-Plated 1008-1045 Carbon Steel







				1/8" × 1/8"

				1/2"	Undersized							-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000


				3/4"	Undersized							-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
				1"	Undersized							-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000




												3/16" × 3/16"

												1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000


						3/4"						Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
						1"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
						1 1/4"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
						1 1/2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
						1 3/4"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
						2"	Undersized					-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000




												1/4" × 1/4"

												3/4"	Oversized	0.000" to 0.001"	0.000" to 0.001"	Not Rated	ASME B17.1 Class 1	5	000000000	00000


								3/4"				Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
								1"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
								1 1/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
								1 1/2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000
								1 3/4"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000
								2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000
								2 1/2"	Undersized			-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000




												3/8" × 3/8"

										1"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	0000


										1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	5	000000000	00000




												1/2" × 1/2"

												1 1/2"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	1	000000000	0000

Tapered Gib Keys

These keys have a tapered body that wedges in to the keyway for a more secure fit than standard machine keys. The gib head makes these keys easy to remove when parts need to be taken apart frequently, such as for maintenance or prototyping. Keys are tapered along their length. Use them to connect gears and other components with tapered keyways to shafts. Keys are made of steel.

Inch—The height of inch keys decreases by _1/8" for every 12" of length. They conform to ASME B17.1 Class 1 standards for dimensions and tolerances.

		Tolerance		Head
	Lg.	Ht.	Wd.	Ht.	Lg.	End Ht.	Rate of Taper	Specs. Met	System of Measurement		Each
1018-1045 Carbon Steel







				3/16" × 3/16"

				1 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/16"	9/32"	0.174"	1:96	ASME B17.1 Class 1	Inch	000000000	00000


				2"	-0.002" to 0.000"	-0.002" to 0.000"	5/16"	9/32"	0.169"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
				3"	-0.002" to 0.000"	-0.002" to 0.000"	5/16"	9/32"	0.158"	1:96	ASME B17.1 Class 1	Inch	000000000	0000




						1/4" × 1/4"

						1 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.237"	1:96	ASME B17.1 Class 1	Inch	000000000	0000


						2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.232"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
						2 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.227"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
						3"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.221"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
						3 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.216"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
						4"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	3/8"	0.211"	1:96	ASME B17.1 Class 1	Inch	000000000	0000




								5/16" × 5/16"

								2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	7/16"	0.295"	1:96	ASME B17.1 Class 1	Inch	000000000	0000


								2 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	7/16"	0.290"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
								3"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	7/16"	0.285"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
								4"	-0.002" to 0.000"	-0.002" to 0.000"	1/2"	7/16"	0.274"	1:96	ASME B17.1 Class 1	Inch	000000000	0000




										3/8" × 3/8"

										1"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.368"	1:96	ASME B17.1 Class 1	Inch	000000000	0000


										1 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.363"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
										2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.358"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
										2 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.353"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
										3"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.348"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
										3 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.342"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
										4"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.337"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
										4 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.332"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
										5"	-0.002" to 0.000"	-0.002" to 0.000"	5/8"	1/2"	0.327"	1:96	ASME B17.1 Class 1	Inch	000000000	0000




												7/16" × 7/16"

												4"	-0.002" to 0.000"	-0.002" to 0.000"	3/4"	9/16"	0.400"	1:96	ASME B17.1 Class 1	Inch	000000000	0000


4 1/2"	-0.002" to 0.000"											-0.002" to 0.000"	3/4"	9/16"	0.395"	1:96	ASME B17.1 Class 1	Inch	000000000	0000




		1/2" × 1/2"

		2"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.484"	1:96	ASME B17.1 Class 1	Inch	000000000	0000


		2 1/2"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.479"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
		3"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.474"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
		3 1/2"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.469"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
		4"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.464"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
		4 1/2"	-0.002" to 0.000"									-0.002" to 0.000"	3/4"	5/8"	0.458"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
		5"	-0.002" to 0.000"	-0.002" to 0.000"								3/4"	5/8"	0.453"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
		5 1/2"	-0.002" to 0.000"	-0.002" to 0.000"	3/4"							5/8"	0.448"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
		6"	-0.002" to 0.000"	-0.002" to 0.000"	3/4"							5/8"	0.443"	1:96	ASME B17.1 Class 1	Inch	000000000	0000




				5/8" × 5/8"

				3"	-0.004" to 0.000"							-0.004" to 0.000"	1"	3/4"	0.600"	1:96	ASME B17.1 Class 1	Inch	000000000	0000


				3 1/2"	-0.004" to 0.000"							-0.004" to 0.000"	1"	3/4"	0.595"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
				4"	-0.004" to 0.000"							-0.004" to 0.000"	1"	3/4"	0.590"	1:96	ASME B17.1 Class 1	Inch	000000000	0000
				4 1/2"	-0.004" to 0.000"							-0.004" to 0.000"	1"	3/4"	0.585"	1:96	ASME B17.1 Class 1	Inch	000000000	00000
				5"	-0.004" to 0.000"	-0.004" to 0.000"						1"	3/4"	0.579"	1:96	ASME B17.1 Class 1	Inch	000000000	00000
				5 1/2"	-0.004" to 0.000"	-0.004" to 0.000"	1"					3/4"	0.574"	1:96	ASME B17.1 Class 1	Inch	000000000	00000
				6"	-0.004" to 0.000"	-0.004" to 0.000"	1"					3/4"	0.569"	1:96	ASME B17.1 Class 1	Inch	000000000	00000




						3/4" × 3/4"

						4"	-0.004" to 0.000"					-0.004" to 0.000"	1 1/8"	7/8"	0.716"	1:96	ASME B17.1 Class 1	Inch	000000000	00000


						4 1/2"	-0.004" to 0.000"					-0.004" to 0.000"	1 1/8"	7/8"	0.711"	1:96	ASME B17.1 Class 1	Inch	000000000	00000
						5"	-0.004" to 0.000"	-0.004" to 0.000"				1 1/8"	7/8"	0.706"	1:96	ASME B17.1 Class 1	Inch	000000000	00000
						5 1/2"	-0.004" to 0.000"	-0.004" to 0.000"	1 1/8"			7/8"	0.701"	1:96	ASME B17.1 Class 1	Inch	000000000	00000
						6"	-0.004" to 0.000"	-0.004" to 0.000"	1 1/8"			7/8"	0.695"	1:96	ASME B17.1 Class 1	Inch	000000000	00000




								7/8" × 7/8"

								4"	-0.004" to 0.000"			-0.004" to 0.000"	1 1/4"	1"	0.842"	1:96	ASME B17.1 Class 1	Inch	000000000	00000


								5 1/2"	-0.004" to 0.000"			-0.004" to 0.000"	1 1/4"	1"	0.827"	1:96	ASME B17.1 Class 1	Inch	000000000	00000
								6"	-0.004" to 0.000"			-0.004" to 0.000"	1 1/4"	1"	0.822"	1:96	ASME B17.1 Class 1	Inch	000000000	00000




										1" × 1"

										5"	-0.004" to 0.000"	-0.004" to 0.000"	1 1/2"	1 1/8"	0.958"	1:96	ASME B17.1 Class 1	Inch	000000000	00000


										6"	-0.004" to 0.000"	-0.004" to 0.000"	1 1/2"	1 1/8"	0.948"	1:96	ASME B17.1 Class 1	Inch	000000000	00000

Machine Key Stock

Cut this square or rectangular key stock to length to create a straight machine key. Straight keys are the most common type of key. Machine keys are often the same material as the shaft and other components with which they are used. To use a key as a sacrificial part, choose a softer key that will shear off when parts are exposed to excessive force, preventing damage to expensive equipment.

Zinc-Plated 1008-1045 Carbon Steel

Zinc-plated 1008-1045 carbon steel key stock is an economical choice with good strength and resists corrosion in wet environments.

Undersized Tolerance—Slightly smaller than the size listed in the table, undersized stock is the choice when you need a slightly looser fit or when you have an inconsistent keyway. Use it when parts need to be taken apart frequently, such as for maintenance or prototyping.

			Tolerance
	Ht. × Wd.	Tolerance Rating	Ht.	Wd.	Min. Hardness	Specs. Met		Each
12" Long



		1" × 5/8"	Undersized	-0.002" to 0.000"	-0.002" to 0.000"	Not Rated	ASME B17.1 Class 1	000000000	000000